Abstract
A lead borate glass of molar composition 49.5H 3BO 3–49.5PbO–1.0Eu 2O 3 was prepared and studied by broadband and fluorescence line narrowing spectral techniques. Site-selective 5D 0 → 7F 0,1 emission spectra were obtained under resonant excitation at different wavelengths along the 7F 0 → 5D 0 transition. These studies have been used to investigate the site-to-site variations in the spectroscopic properties of Eu 3+ ions in the lead borate glass at 13 K. The energies of the Stark levels of the 7F 1 multiplets are obtained from the experimental fluorescence line narrowing spectra and crystal-field analysis has been carried out, assuming C 2v orthorhombic symmetry, for each of the excitation energies. The distribution environments and the local structures of Eu 3+ ions in lead borate glass are found to be almost similar to calcium diborate glass and lies intermediate between Eu 3+-doped sodium borosilicate and lithium fluoroborate glasses.
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